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Our Parsha opens with Hashem, as we understand, visiting Avraham Aveinu on the 3rd day after Bris Milah, when Avraham was at the height of his pain following the circumcision, as Rashi indicates, “to inquire about his welfare.” (Metsuda Linear Chumash rendering of Rashi on Perek 18, posuk 1)
It’s not like Hashem needed to pay a visit to ascertain Avraham’s actual condition for, Hashem is the Creator, The Master, The Ruler over the world who knows and is aware of everything. And so we learn and gain insight from this first posuk as to the Mitzvah of Bikur Cholim; showing, caring, giving strength and encouragement to the ill by visiting and caring about them.